Looks like a lot of other folks are also trying to help. I don't like to "play" with other folks images, so this is a fairly simple noise removal using Neat Image in PS CS6 after using ACR 8.x to do the raw conversion.
The one thing that I did take the liberty of doing is to tweak the white balance using the white flowers as a best guess at white reference. From my limited experience, white artificial flowers are a good bet to be white while a white dress usually isn't.
I applied selective noise reduction in a couple layers mostly to the background and to a lesser extent to to everything else except for the veil and hair which I didn't touch because noise reduction would have killed the subtle detail.
I didn't do any other type of editing that you may or may not want to do yourself such as sharpening the jewelry or brightening her eyes. It is too easy to get carried away with editing so I generally go for less.
Anyway, if you click on the image it will take you to a full size JPG that I have temporarily placed in my PBase photo gallery. The full size version is better for showing the noise reduction and details. This version is sRGB and there is also a ProPhotoRGB version at http://www.pbase.com/bill_boehme/potn_stuff, but I don't really see any meaningful difference between the two.
If interested, I have PSD versions (layered and flat) if you care for them and if there is someplace to upload them.
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Basically, I think that the noise isn't bad especially if the image is to to be printed or scaled down for viewing on screen. The noise in the 5D II really isn't bad at ISO 1600 and about the only time that it is objectionable is when pixel peeping. In any event, it cleans up quite easily.